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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd841e6ee8c431603139129fbf61ab8205efe14659a72c096a5451501c2d049c9' 
  AND token = '0ieHKbDYdc8QHNdhEYWj4ClrVAXbKzvJXRDv0rR6zjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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