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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c370ce524f3198666b5c02fb4d8790ce008ddb72f6914fdcbbda62ed1aec45e7' 
  AND token = 'W1rHhrOwwMCesYvt13bdT+YgTdVHsekNpkw1crbRzkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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