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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50d568f2e9a8e060254a78d15ba162a32c5d5e7c20c5d6d5d61a9c5dbdd3d223' 
  AND token = 'H25U3EqmSJvrELeSAAI1k+cSgMSxcTWd5VMOgCxsC2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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