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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc3019fa2cf9072944359476916fd39a4b8041907b08eead4ae06d11e5c39f60' 
  AND token = 'DxGckSRlkkg+sigwjxGIn7yrK+letMT05sOUfMTRHkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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