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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '639620c95b462ebb46820e6e3b63b8ab4a15ce73a8e10ac94a00affbc8029e00' 
  AND token = 'feIarjF3hnMCGIv1Xt2A7Qn52QlDUQbYVa3Y40f1X4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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