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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '789b5a36832c9d15fbbd162d0ef5e3653e45f6d014a0baea0c9d6b9a1059ad63' 
  AND token = 'oqLyz2GyuywjufzTgqv0OUhtR3p70Tej2wMLMIWXzcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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