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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c2a3cb8f1e034df8e052ee625a0ccf60266105ca995e51d4a67366073df05f9' 
  AND token = 'gfwKPz16h6pFPZCD3v0pWtbwg0CfFxSwEJ0jIe7ZfLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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