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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4a25ed74ace13b3cb75e8b61557dc5eea0842697b0cc327d8699d9019233a4b' 
  AND token = 'ATG3sbiARkDVrQNqCF75ERPMj/WfhZEaBfs9HxmW+08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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