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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c202be1b18b8fd4657f70143da4d6ea7889182476b5d49cf395da82332b20e86' 
  AND token = 'TW05D/9HeAFqFN9gwlNvemBYipLeleeNUf95w1rmvRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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