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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '642fbe28c73dd8bf506b1f1b35412059d26e5f476050fcc5868ed2051ddb26cc' 
  AND token = 'w0n3l0NdQs5HK1zqdREm0ae1FcPUWxsqFzdNx0KioP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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