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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2dc713a14f3e358c06edb749cbde1fc563adb588aebe6d7128e235e444889617' 
  AND token = 'uybMrbVrA4ihJtfz2BOhaj/r5GuBa2y+s2tGI4KNLV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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