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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '873b255bc0c604e685144bec53e07d6224f8cde82a9e9d254d5bf7fcf43bd8fc' 
  AND token = 'iBv9fWb8B/LpISQiHoik+zr7hk8bYFsy6Qb5K1auj/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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