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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '186648819bec1980978ab0628cb280b99a9f859b09f0f726814223b4badb9ff1' 
  AND token = 'IDaaVqWkzhWSUVJt8SI9MlZ3vNwu2+Zzk+wFbdz2UDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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