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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f47f718fe25cadd31cb1988ddc12271a9b87dd899dca644e8ebc1d8eea2d5115' 
  AND token = 'yMGnqYH1gPYH+tPlikxmBEZpRHTAedDcVmyeJySFa0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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