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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a1907b7b8d49c615776a419a9af532e0b5cfa17efe46ac452772d2edcf42040' 
  AND token = '7+AeS9CIV3J8dKLp/OC0dUk0MTckjpqzS8U/Fxm9wO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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