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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fcfc5670e236b35eefe511c175364736f715a138b78c318d41d7a3cc5395a73' 
  AND token = 'a6OAf+7QUTk3rZmOPsYn3HhJTzafgGh1kqnH97YR0TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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