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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8830ab4ba5447fb7bc8b8fd59150daae8502233efd3399c0dec2c2eab927925' 
  AND token = 'cfcmptnQy9m8oJslXdAIlg92b3gjkBfhXHXDbG2+gfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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