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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab045ffba680e697d7ae19aace78b7215a169bdccf8db6bd6af71c730cffdc7c' 
  AND token = 'xl8MnRPYmaH23a4vczvZJrghpCcbkEd/Z1AlBRkMg7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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