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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '241a98a643ecc5c91635efe1551ad523b3edc329b292f57e5afbc5510a3a7b36' 
  AND token = '4dYkuH2Rt95fzjeaMxWbVz66ajjpXmYp7DNo8hllIMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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