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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4223eb4882540ecefe7fb9f431902b70801a5fe49e831cfd0c4323921be37191' 
  AND token = 'ZBrZfwgDb7T85pMIQry8z1h2N7asSVyZJrrXNOsANAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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