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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50aa03365e0b7850e575de0b8623322c047f7dc3a62e671ee64cc8b9fa5cea45' 
  AND token = 's++1ZstNuHwCfJ0FxRwYgoyt0WrnPAXty6U1nhpQAMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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