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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '390b4020591e623e452cbf6ff1825d24309d6b2c9bf3dad363fbf0469123b5df' 
  AND token = 'xysDX14QyR7y6FRCvCY/xWuL3stnezXb1Z4hKr0q94A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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