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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec4f91c7dc1906b474c7d83415b0e26ae9f597609efb6c411c47765242ed9506' 
  AND token = 'ifay+imBdQeMdsR5SNFMKqGpny6/nWNYbZeV6YSNIwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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