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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d63274b4292e917cb9df473f59803d38b85ee9af737f98d31d537c28b359a7a' 
  AND token = 'uYHroU7zgwazYS5WzqPUTzWk0RsbZbAiBaRiM87bHdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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