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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f744a2ddd7cee2032b929709c7671c568fae65aa61de974d86faa786e7b2a12' 
  AND token = '3EwsAekU62wa8ir9xJH6RBHErnw9GlsBrQws2lPY5hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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