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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4af85980a82a65a0df13e55cfce5a0cb7dea7ad7c2203f4d04fe34eebf93a1fc' 
  AND token = 'i4Av8W9UYUCnJ8XN3FVx/pfE+oQgFCNarterhABk9zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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