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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86859e6adf7fec5e9ac8a2656281b6b6469f0f5a5313eacb5cdb5ede0c50715c' 
  AND token = 'jY+lACvTBaMeNkLuUINGL/0J1cNd98JJXVXf5tA1WKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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