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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06eb8533b3f4ce1d6f63046dfc9ac1df5d132c50c50b3444408b5be2c4dc9f44' 
  AND token = '0FJb3xUhe3htZU6W/KcYbaMqdSGIQqLC0XxwlRK5txY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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