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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '240d4d1f0d8b1365032c27996ef58ddd344e869ebacd6674bf2142bfc2be6023' 
  AND token = 'aXjRgmr13QqJVdL2JyECHMx0ysvKtfVaHhN0isC2YQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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