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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b60828f8619128b58dacd597afd8c56a0b418132c5b50c34f693d73ebcc26649' 
  AND token = '9tBjS4E8/NeiADHl7vgshhjgbzSzQFjWS7RSeayogg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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