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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6facc9d56785dc6e8433c3719b8c868b08412b49f6826c62a86e5d909ddebba0' 
  AND token = 'X5LRaCTywHFpKuNeHD5Hkn/vyS75BugxcZyC5QEpXaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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