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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96f6536d3ed2446e77efb5a88354d21c41a2ca05484db7f198811c44c0e264f3' 
  AND token = 'G0Eab2u6jBxBs0S65QrcueLOo4lQb+05aZsFjRjh894=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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