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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e2024f30f5304cffbd7f508ae0232e182195f10e22f5111eaebe4fa587c5aad' 
  AND token = 'SxyixmyMrG6ENXyC516R5ov613b3hnir6BuNCd8pbkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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