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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5dfb0d70ac0f5192aa7b5b743dc077bf092dce6fd4ef1f4bfd568af4abe75ff' 
  AND token = 'g26d+c+IFdxPmF+zUkc+d3eu4Xw/XNN6H7bNA6BWlHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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