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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5546ce2a05365d8fc15573969b7e43f0f683257eb3579a59d3f447de0d3e1db' 
  AND token = 'n7Qoduz7OS/6KFEWdhSCptrBIFIhOX1D4lKBix0BgFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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