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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eca28d354e034046eebde3a6132d811a736fe257ce7abc55302a51c94a16eca6' 
  AND token = 'bIIi1xziyPhEGfoC0hnfsJruiHubv84rRL/Ap+01FkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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