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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6a0d399e7e5c629f90c9b92cdd0a5229622218973506b951d13f0166e08670b' 
  AND token = 'wOG8HUfwFLojZApu8tjNyZhr+TiPGHp1sV2KKXTyMu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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