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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb8960f13b095c92bf9f0473f528e73112fd8e6e3dfa5b532089ba246f41fca9' 
  AND token = 'SL8jGkjZWbFttY6yQL2bBx2bBnmgdLvQMrHkpl8Pkrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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