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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e097eddf1c225e4278f206d972921d8293356b9d71667a045a72beb21fbb3da' 
  AND token = 'MM5qhSknNyj330amKUASnmFGcKx6OeiK6khVRj6kJ/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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