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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f70f2778b6c4ecafbe3eedbb239c069d0e25c48c7a4f3af9f93ea3417a985fe' 
  AND token = 'D1iD8/OrRA7YhK5PdIzC2T36FBUY769WJ17hQbl9okc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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