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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5a683d6d87dd84ed44a2f9a8659f6e5a3bc9220e012183ab45bc64af32167e9' 
  AND token = 'OwTnSCgxZR3UPC29/7zXiFMTd6EyfpaQxKnDEVojzaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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