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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76f82edbc9326dd0b19fec4bf7c426966f7294b65c0bc67b9bbf176b5604246e' 
  AND token = 'tb1kZeTKYzDhDb/TOpiTA3FjSagpxZbBL3P1wtjarm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}