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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecab875e6f9b10b1b15434a9edce47f9e4743698a0d07cf1dff13c50c88786c4' 
  AND token = 'dlmX4RnqChdVCmodhVQsFw/Jxyrwhhc+cESCUk1c8YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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