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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad8f3448dbd37919bc42eb2da959d74deb43faef10949bb8aa3fac2b2bd8313a' 
  AND token = '2jrSl8OBf2xZIWEOWzQrtNPOc6ebbY5kkY6bs322CWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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