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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83413a8b381823435eef0b0c0261297febbf86e977f9f02b3d9d606cc62ffea3' 
  AND token = 'hx2az+YCEX8Qrk5mcqs5OEyRV6dGW80IaxgiyNNurrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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