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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d9b138e9d697dabb61b5124d8762003ac8ce9eb9483cc5da735d9fb05a56197' 
  AND token = 'EFclAwz1YVG/Cdanm4zEGq0EB4eBA9Zt0tdmgTw01UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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