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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acd67ea7820a22fde0f1d532ac64effa9401e96fbb64d2d28eb2ee2cd92f3bec' 
  AND token = '4R/Zrx+IglwUViVc8+qGEJJAIfJjMbQTcyIdYNPiNLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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