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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36ad6d347e949916fc8ba682628066a4fb63adeeacbb3637cbd9996ab732e000' 
  AND token = 'Ok3wRj9LM7DOo1kxRLK2GDRaIZ1uwGn/KNwDNHIUhdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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