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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d7a189ab272d544a99fbcc4c9371eef0918e60b0b436c7921f4112835bcd986' 
  AND token = 'q9ggDLKTr31SkF+jXfx5NeVfStx3PMwWy8Drk0dTolQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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