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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '168b177a0fe8c20c27f06bf9dda9fd0f8023ff02bf89c60915d48d08fe5841bf' 
  AND token = 'tS7IHDnfclLuyUXBppcHtuOor7XGb2moxAk9qq1D0DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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